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Arbovirus Infections As Screening Tools for the Identification of Viral Immunomodulators and Host Antiviral Factors
Published on: September 13, 2018
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Bacterial effector screening reveals RNF214 as a virus restriction factor in mammals.
Aaron Embry1, David F Schad1, Emily A Rex1
1Department of Microbiology, University of Texas Southwestern Medical Center, Dallas, Texas, United States of America.
Plos Pathogens
|April 22, 2025
Summary
Bacterial proteins reveal RNF214, a key innate immunity factor restricting arboviruses. This protein specifically targets single-stranded RNA viruses, independent of interferon signaling, offering new antiviral strategies.
Area of Science:
- Virology
- Immunology
- Microbiology
Background:
- Arthropod-borne viruses (arboviruses) present significant global health challenges.
- Bacterial effector proteins have previously been used to identify insect host restriction factors for arboviruses.
- This study extends the use of bacterial effectors to identify mammalian antiviral factors.
Purpose of the Study:
- To identify host immunity factors in bats and humans that restrict arbovirus replication using a bacterial effector screening system.
- To characterize the function of identified factors, particularly RNF214, in antiviral defense.
Main Methods:
- Bacterial effector screens were performed in bat and human cells to identify factors modulating arbovirus replication.
- The Shigella flexneri effector IpaH4 was used to identify its mammalian target.
- RNF214 was identified, and its ubiquitination, degradation, and functional role in antiviral immunity were assessed.
- Viral replication assays and interferon-stimulated gene expression analysis were conducted.
Main Results:
- Three bacterial effectors enhanced arbovirus replication in mammalian cells.
- The E3 ubiquitin ligase IpaH4 targets and degrades RNF214.
- RNF214 restricts arbovirus replication in a manner dependent on its E3 ligase activity.
- RNF214 specifically inhibits single-stranded RNA viruses independently of the interferon response.
Conclusions:
- RNF214 is a novel host factor critical for innate immunity against single-stranded RNA viruses.
- Bacterial effector systems are effective tools for discovering mammalian antiviral mechanisms.
- RNF214 represents a potential target for developing new antiviral therapies.
